GB2373964A - System for lost packet recovery in voice over internet protocol based on time domain interpolation - Google Patents

System for lost packet recovery in voice over internet protocol based on time domain interpolation Download PDF

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Publication number
GB2373964A
GB2373964A GB0214264A GB0214264A GB2373964A GB 2373964 A GB2373964 A GB 2373964A GB 0214264 A GB0214264 A GB 0214264A GB 0214264 A GB0214264 A GB 0214264A GB 2373964 A GB2373964 A GB 2373964A
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GB
United Kingdom
Prior art keywords
frame
missing
time domain
energy
frames
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0214264A
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GB0214264D0 (en
Inventor
Senthil Sengodan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Inc
Original Assignee
Nokia Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Inc filed Critical Nokia Inc
Publication of GB0214264D0 publication Critical patent/GB0214264D0/en
Publication of GB2373964A publication Critical patent/GB2373964A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/005—Correction of errors induced by the transmission channel, if related to the coding algorithm

Abstract

A lost packet recovery device, method and computer program for use in a VoIP system in which lost packets containing voice information are replaced using time domain interpolation techniques. These time domain interpolation techniques employ two different approaches to interpolate missing data packets. The first approach relies on time domain harmonic scaling to interpolate a replacement frame for a missing frame using the frames that come before and after the missing frame. The second approach replicates a frame immediately prior to the missing frame. This replicated frame then has an energy reduction function applied to it to gradually reduce the energy output level of the data samples in the frame. This replicated frame is then used to replace the missing frame. In the second approach, the process of duplicating the prior frame and reducing its energy levels using an energy reduction function is repeated until no further missing frames are detected. Once no further missing frames are detected, an energy restoration function is applied to the next available frame to gradually increase its energy level and provide for a smooth transition. Using these techniques, missing frames of voice data may be replaced to mask the effects of missing frames to a listener.

Description

all, U K Patent Application fig, GB all, 2 373 964 all, A (43) Date of
Printing by UK Office 02.10.2002 (21) Application No 0214264.4 (5) INTCL7 G10L 19/00
(22) Date of Filing 24.01.2001 (52) UK CL (Edition T) (30) Priority Data H4K KOA (31) 09490387 (32) 24.01.2000 (33) US
(56) Documents Cited by ISA (86) International Application Data WO 1999/066494 A PCT/US2001/002232 En 24.01.2001 REN-HUA WANG ET AL:"A 192to-24 channel digital speech interpolation system using TDHS/ARC" (87) International Publication Data globecom '82. IKE GLOBAL TELECOMMUNICATIONS WO2001/054116 En 26.07.2001 CONFERENCE, MIAMI,FLUSA, 29 NOV.-2 DEC. 1982, pages 133 1339 vol.3, XP000990925 1982, New York, NY, USA, IEEE, USA abstract (71) Applicant(s) Nokia Inc (58) Field of Search by ISA
llncorporated in USA - Texas) INT CL7 G10L 6000 Connection Drive, Irving, Texas 75039, EPO-lnternal, WPI Data, INSPEC United States of America (72) Inventor(s) Senthil Sengodan (74) Agent and/or Address for Service Venner Shipley & Co 20 Little Britain, LONDON, EC1A 7DH, United Kingdom (54) Abstract Title System for lost packet recovery in voice over internet protocol based on time domain interpolation (57) A lost packet recovery device, method and computer program for use in a VolP system in which lost packets containing voice information are replaced using time domain interpolation techniques. These time domain interpolation techniques employ two different approaches to interpolate missing data packets. The first approach relies on time domain harmonic scaling to interpolate a replacement frame for a missing frame using the frames that come before and after the missing frame. The second approach replicates a frame immediately prior to the missing frame. This replicated frame then has an energy reduction function applied to it to gradually reduce the energy output level of the data samples in the frame. This replicated frame is then used to replace the missing frame. In the second approach, the process of duplicating the prior frame and reducing its energy levels using an energy reduction function is repeated until no further missing frames are detected. Once no further missing frames are detected, an energy restoration function is applied to the next available frame to gradually increase its energy level and provide for a smooth transition. Using these techniques, missing frames of voice data may be replaced to mask the effects of missing frames to a listener.
C) W CD D
GB0214264A 2000-01-24 2001-01-24 System for lost packet recovery in voice over internet protocol based on time domain interpolation Withdrawn GB2373964A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49038700A 2000-01-24 2000-01-24
PCT/US2001/002232 WO2001054116A1 (en) 2000-01-24 2001-01-24 System for lost packet recovery in voice over internet protocol based on time domain interpolation

Publications (2)

Publication Number Publication Date
GB0214264D0 GB0214264D0 (en) 2002-07-31
GB2373964A true GB2373964A (en) 2002-10-02

Family

ID=23947822

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0214264A Withdrawn GB2373964A (en) 2000-01-24 2001-01-24 System for lost packet recovery in voice over internet protocol based on time domain interpolation

Country Status (3)

Country Link
AU (1) AU2001229732A1 (en)
GB (1) GB2373964A (en)
WO (1) WO2001054116A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6549886B1 (en) 1999-11-03 2003-04-15 Nokia Ip Inc. System for lost packet recovery in voice over internet protocol based on time domain interpolation
SG97934A1 (en) * 2000-09-13 2003-08-20 Mediaring Ltd Quality of transmission across packet-based networks
FR2830970B1 (en) * 2001-10-12 2004-01-30 France Telecom METHOD AND DEVICE FOR SYNTHESIZING SUBSTITUTION FRAMES IN A SUCCESSION OF FRAMES REPRESENTING A SPEECH SIGNAL
US8046667B2 (en) 2002-04-19 2011-10-25 Thomson Licensing Synchronization loss resilient digital communication system using forward erasure correction
GB0416720D0 (en) 2004-07-27 2004-09-01 British Telecomm Method and system for voice over IP streaming optimisation
US7738768B1 (en) 2005-12-16 2010-06-15 The Directv Group, Inc. Method and apparatus for increasing the quality of service for digital video services for mobile reception
CN101437009B (en) 2007-11-15 2011-02-02 华为技术有限公司 Method for hiding loss package and system thereof
US8718804B2 (en) * 2009-05-05 2014-05-06 Huawei Technologies Co., Ltd. System and method for correcting for lost data in a digital audio signal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999066494A1 (en) * 1998-06-19 1999-12-23 Comsat Corporation Improved lost frame recovery techniques for parametric, lpc-based speech coding systems

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5907822A (en) * 1997-04-04 1999-05-25 Lincom Corporation Loss tolerant speech decoder for telecommunications
US6661793B1 (en) * 1999-01-19 2003-12-09 Vocaltec Communications Ltd. Method and apparatus for reconstructing media

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999066494A1 (en) * 1998-06-19 1999-12-23 Comsat Corporation Improved lost frame recovery techniques for parametric, lpc-based speech coding systems

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
REN-HUA WANG ET AL:"A 192-to-24 channel digital speech interpolation system using TDHS/ARC" globecom '82. IEE GLOBAL TELECOMMUNICATIONS CONFERENCE, MIAMI,FLUSA, 29 NOV.-2 DEC. 1982, pages 1334-1339 vol.3, XP000990925 1982, New York, NY, USA, IEEE, USA abstract *

Also Published As

Publication number Publication date
GB0214264D0 (en) 2002-07-31
WO2001054116A1 (en) 2001-07-26
AU2001229732A1 (en) 2001-07-31

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)